I can not reference Schema

From: jum <sirrat_k@hotmail.com> Date: Tue, 14 May 2002 18:32:45 -0700 Message-Id: <5.1.0.14.1.20020514183241.02a9ad78@localhost> To: W3C XML Schema Comments list <www-xml-schema-comments@w3.org> · This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 23 October 2007 06:13:30 GMT

Example

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3schools.com"
xmlns="http://www.w3schools.com"
elementFormDefault="qualified">

<xs:element name="note">
     <xs:complexType>
       <xs:sequence>
         <xs:element name="to" type="xs:string"/>
         <xs:element name="from" type="xs:string"/>
         <xs:element name="heading" type="xs:string"/>
         <xs:element name="body" type="xs:string"/>
       </xs:sequence>
     </xs:complexType>
</xs:element>

</xs:schema>

file :  note.xsd


<?xml version="1.0"?>

<note
xmlns="http://www.w3schools.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3schools.com note.xsd">

<to11111>Tove</to11111>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>


file: *.xml

Why do not check that it have show error when use Editor check